5.若有理数m,n满足/2m+1/+(n+2)的平方=0,则mn等于() A.-1 B.-2 C

问题描述:

5.若有理数m,n满足/2m+1/+(n+2)的平方=0,则mn等于() A.-1 B.-2 C
5.若有理数m,n满足/2m+1/+(n+2)的平方=0,则mn等于() A.-1 B.-2 C.2 D.1

D